Seventh person has been arrested by British police on Thursday arrested in connection with the massacre at a Manchester pop concert that left 22 people dead.

There was no sign of campaigning for the June 8 election as military personnel took up positions at key locations such as Buckingham Palace, Downing Street and Westminster to free armed police for counter-terrorism operations after Monday's Manchester terror attack.

Police made the arrests south of the city, where a day earlier a 23-year-old man was also arrested and a number of homes were searched.

Abedi reportedly returned from Libya only a few days before the attack which killed 22 people including several children but police are still trying to pin down his movements as well as a wider network. Investigators believe it's "likely" that Abedi had help to carry out the attack.

British Prime Minister Theresa May has since raised the MI5 threat level of global terrorism to the highest possible level of "critical" in Great Britain following the decision of the government's independent crisis response committee.

Government officials said almost 1,000 soldiers were deployed to Buckingham Palace, Parliament and other high-profile sites across the country.

He was born in Manchester in 1994 to parents of Libyan birth and raised in Britain. Neighbors recalled him as tall, thin and quiet, and said he often wore traditional Islamic dress.

Hours before the photos of the bomb fragments appeared in the U.S. media, Ms Rudd had scolded the USA security services saying that she was "irritated" by the releasing of the name of the bomber before it was made public in the UK.

The bomber killed 22 people in the attack on a concert hall in the northern English city. Another suspect was arrested Tuesday and Abedi's father confirmed to The Associated Press that was Salman's older brother Ismail. Authorities have discovered no evidence of a link between the attacker and an established terror group, a British counterterrorism official toldCNN.

Greater Manchester Police Chief Constable Ian Hopkins said these past few days have been "intense" for the officers and staff of the department but that they continue to make progress in the investigation.

Rudd says Britain's increased official threat level will remain at "critical" as the investigation proceeds.

Asked whether the United States leaks had compromised the investigation, she said: "I wouldn't go that far but I can say that they are perfectly clear about the situation and that it shouldn't happen again".

Officials said all of the bombing victims have been identified, but names were being withheld until autopsies were completed.

Her husband was listed in critical condition while her children were treated for injuries.

Britain's Prime Minister Theresa May had previously warned Trump that the fact sensitive information about the investigation has repeatedly been handed to American outlets could undermine the "special relationship" between the two countries.

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